<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>AdminLTE 3 | 按钮</title>
  <!-- 告诉浏览器屏幕自适应 -->
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <!-- Font Awesome -->
  <link rel="stylesheet" href="../../plugins/fontawesome-free/css/all.min.css">
  <!-- Ionicons -->
  <link rel="stylesheet" href="https://cdn.bootcss.com/ionicons/2.0.1/css/ionicons.min.css">
  <!-- 主题样式 -->
  <link rel="stylesheet" href="../../dist/css/adminlte.min.css">
  <!-- 离线 Google 字体: Source Sans Pro -->
  <link href="/AdminLTE/AdminLTE-3.x/dist/css/google.css?family=Source+Sans+Pro:300,400,400i,700" rel="stylesheet">
</head>
<body class="hold-transition sidebar-mini">
<div class="wrapper">
  <!-- 导航栏 -->
  <nav class="main-header navbar navbar-expand navbar-white navbar-light">
    <!-- 左侧导航栏链接 -->
    <ul class="navbar-nav">
      <li class="nav-item">
        <a class="nav-link" data-widget="pushmenu" href="#" role="button"><i class="fas fa-bars"></i></a>
      </li>
      <li class="nav-item d-none d-sm-inline-block">
        <a href="../../index3.html" class="nav-link">首页</a>
      </li>
      <li class="nav-item d-none d-sm-inline-block">
        <a href="#" class="nav-link">联系</a>
      </li>
    </ul>

    <!-- 搜索表单 -->
    <form class="form-inline ml-3">
      <div class="input-group input-group-sm">
        <input class="form-control form-control-navbar" type="search" placeholder="搜索" aria-label="Search">
        <div class="input-group-append">
          <button class="btn btn-navbar" type="submit">
            <i class="fas fa-search"></i>
          </button>
        </div>
      </div>
    </form>

    <!-- 右侧导航栏链接 -->
    <ul class="navbar-nav ml-auto">
      <!-- 消息下拉菜单 -->
      <li class="nav-item dropdown">
        <a class="nav-link" data-toggle="dropdown" href="#">
          <i class="far fa-comments"></i>
          <span class="badge badge-danger navbar-badge">3</span>
        </a>
        <div class="dropdown-menu dropdown-menu-lg dropdown-menu-right">
          <a href="#" class="dropdown-item">
            <!-- 消息开始 -->
            <div class="media">
              <img src="../../dist/img/user1-128x128.jpg" alt="用户头像" class="img-size-50 mr-3 img-circle">
              <div class="media-body">
                <h3 class="dropdown-item-title">
                  Brad Diesel
                  <span class="float-right text-sm text-danger"><i class="fas fa-star"></i></span>
                </h3>
                <p class="text-sm">有空的话就打电话给我...</p>
                <p class="text-sm text-muted"><i class="far fa-clock mr-1"></i> 4 小时前</p>
              </div>
            </div>
            <!-- 消息结束 -->
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item">
            <!-- 消息开始 -->
            <div class="media">
              <img src="../../dist/img/user8-128x128.jpg" alt="用户头像" class="img-size-50 img-circle mr-3">
              <div class="media-body">
                <h3 class="dropdown-item-title">
                  John Pierce
                  <span class="float-right text-sm text-muted"><i class="fas fa-star"></i></span>
                </h3>
                <p class="text-sm">我收到你的消息了</p>
                <p class="text-sm text-muted"><i class="far fa-clock mr-1"></i> 4 小时前</p>
              </div>
            </div>
            <!-- 消息结束 -->
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item">
            <!-- 消息开始 -->
            <div class="media">
              <img src="../../dist/img/user3-128x128.jpg" alt="用户头像" class="img-size-50 img-circle mr-3">
              <div class="media-body">
                <h3 class="dropdown-item-title">
                  Nora Silvester
                  <span class="float-right text-sm text-warning"><i class="fas fa-star"></i></span>
                </h3>
                <p class="text-sm">主题在这里</p>
                <p class="text-sm text-muted"><i class="far fa-clock mr-1"></i> 4 小时前</p>
              </div>
            </div>
            <!-- 消息结束 -->
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item dropdown-footer">查看所有消息</a>
        </div>
      </li>
      <!-- 通知下拉菜单 -->
      <li class="nav-item dropdown">
        <a class="nav-link" data-toggle="dropdown" href="#">
          <i class="far fa-bell"></i>
          <span class="badge badge-warning navbar-badge">15</span>
        </a>
        <div class="dropdown-menu dropdown-menu-lg dropdown-menu-right">
          <span class="dropdown-item dropdown-header">15 条通知</span>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item">
            <i class="fas fa-envelope mr-2"></i> 4 条新消息
            <span class="float-right text-muted text-sm">3 分钟前</span>
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item">
            <i class="fas fa-users mr-2"></i> 8 个好友请求
            <span class="float-right text-muted text-sm">12 小时前</span>
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item">
            <i class="fas fa-file mr-2"></i> 3 个新报告
            <span class="float-right text-muted text-sm">2 天前</span>
          </a>
          <div class="dropdown-divider"></div>
          <a href="#" class="dropdown-item dropdown-footer">查看所有通知</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-widget="control-sidebar" data-slide="true" href="#" role="button">
          <i class="fas fa-th-large"></i>
        </a>
      </li>
    </ul>
  </nav>
  <!-- /.navbar -->

  <!-- 主侧边栏容器 -->
  <aside class="main-sidebar sidebar-dark-primary elevation-4">
    <!-- 品牌 Logo -->
    <a href="../../index3.html" class="brand-link">
      <img src="../../dist/img/AdminLTELogo.png"
           alt="AdminLTE Logo"
           class="brand-image img-circle elevation-3"
           style="opacity: .8">
      <span class="brand-text font-weight-light">AdminLTE 3</span>
    </a>

    <!-- Sidebar -->
    <div class="sidebar">
      <!-- Sidebar user (optional) -->
      <div class="user-panel mt-3 pb-3 mb-3 d-flex">
        <div class="image">
          <img src="../../dist/img/user2-160x160.jpg" class="img-circle elevation-2" alt="用户头像">
        </div>
        <div class="info">
          <a href="#" class="d-block">Alexander Pierce</a>
        </div>
      </div>

      <!-- 侧边栏菜单 -->
      <nav class="mt-2">
        <ul class="nav nav-pills nav-sidebar flex-column" data-widget="treeview" role="menu" data-accordion="false">
          <!-- 使用 .nav-icon 类添加图标，
               或使用 font-awesome 或其他任何图标字体库 -->
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-tachometer-alt"></i>
              <p>
仪表盘
                <i class="right fas fa-angle-left"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../../index.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>仪表盘 v1</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../../index2.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>仪表盘 v2</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../../index3.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>仪表盘 v3</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item">
            <a href="../widgets.html" class="nav-link">
              <i class="nav-icon fas fa-th"></i>
              <p>
小部件
                <span class="right badge badge-danger">新</span>
              </p>
            </a>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-copy"></i>
              <p>
                布局选项
                <i class="fas fa-angle-left right"></i>
                <span class="badge badge-info right">6</span>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../layout/top-nav.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>顶部导航</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/top-nav-sidebar.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>顶部导航 + 侧边栏</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/boxed.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>盒式布局</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/fixed-sidebar.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>固定侧栏</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/fixed-topnav.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>固定导航栏</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/fixed-footer.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>固定页脚</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../layout/collapsed-sidebar.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>折叠侧边栏</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-chart-pie"></i>
              <p>
图表
                <i class="right fas fa-angle-left"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../charts/chartjs.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>ChartJS 插件</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../charts/flot.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>Flot 插件</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../charts/inline.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>内联图表</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview menu-open">
            <a href="#" class="nav-link active">
              <i class="nav-icon fas fa-tree"></i>
              <p>
                UI 元素
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../UI/general.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>常规</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/icons.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>图标</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/buttons.html" class="nav-link active">
                  <i class="far fa-circle nav-icon"></i>
                  <p>按钮</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/sliders.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>滑块</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/modals.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>弹框 & 提醒</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/navbar.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>导航 & 选项卡</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/timeline.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>时间线</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../UI/ribbons.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>丝带</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-edit"></i>
              <p>
表单
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../forms/general.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>常规元素</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../forms/advanced.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>高级表单</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../forms/editors.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>编辑器</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../forms/validation.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>验证</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-table"></i>
              <p>
表格
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../tables/simple.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>简单表格</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../tables/data.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>数据表格</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../tables/jsgrid.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>jsGrid 插件</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-header">示例</li>
          <li class="nav-item">
            <a href="../calendar.html" class="nav-link">
              <i class="nav-icon far fa-calendar-alt"></i>
              <p>
日历
                <span class="badge badge-info right">2</span>
              </p>
            </a>
          </li>
          <li class="nav-item">
            <a href="../gallery.html" class="nav-link">
              <i class="nav-icon far fa-image"></i>
              <p>
相册
              </p>
            </a>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon far fa-envelope"></i>
              <p>
邮箱
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../mailbox/mailbox.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>收件箱</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../mailbox/compose.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>写信</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../mailbox/read-mail.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>查看</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-book"></i>
              <p>
页面
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../examples/invoice.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>发票</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/profile.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>资料</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/e-commerce.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>电子商务</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/projects.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>项目</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/project-add.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>添加项目</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/project-edit.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>编辑项目</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/project-detail.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>项目详情</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/contacts.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>联系人</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon far fa-plus-square"></i>
              <p>
附加
                <i class="fas fa-angle-left right"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="../examples/login.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>登录</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/register.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>注册</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/forgot-password.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>忘记密码</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/recover-password.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>重置密码</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/lockscreen.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>锁屏</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/legacy-user-menu.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>传统用户菜单</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/language-menu.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>多国语言</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/404.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>404 错误</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/500.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>500 错误</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/pace.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>加载状态</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../examples/blank.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>空白页</p>
                </a>
              </li>
              <li class="nav-item">
                <a href="../../starter.html" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>起始页</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-header">杂项</li>
          <li class="nav-item">
            <a href="/AdminLTE/AdminLTE-3.x/docs/" class="nav-link">
              <i class="nav-icon fas fa-file"></i>
              <p>文档</p>
            </a>
          </li>
          <li class="nav-header">多级示例</li>
          <li class="nav-item">
            <a href="#" class="nav-link">
              <i class="fas fa-circle nav-icon"></i>
              <p>一级</p>
            </a>
          </li>
          <li class="nav-item has-treeview">
            <a href="#" class="nav-link">
              <i class="nav-icon fas fa-circle"></i>
              <p>
                一 级
                <i class="right fas fa-angle-left"></i>
              </p>
            </a>
            <ul class="nav nav-treeview">
              <li class="nav-item">
                <a href="#" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>二级</p>
                </a>
              </li>
              <li class="nav-item has-treeview">
                <a href="#" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>
                    二 级
                    <i class="right fas fa-angle-left"></i>
                  </p>
                </a>
                <ul class="nav nav-treeview">
                  <li class="nav-item">
                    <a href="#" class="nav-link">
                      <i class="far fa-dot-circle nav-icon"></i>
                      <p>三级</p>
                    </a>
                  </li>
                  <li class="nav-item">
                    <a href="#" class="nav-link">
                      <i class="far fa-dot-circle nav-icon"></i>
                      <p>三级</p>
                    </a>
                  </li>
                  <li class="nav-item">
                    <a href="#" class="nav-link">
                      <i class="far fa-dot-circle nav-icon"></i>
                      <p>三级</p>
                    </a>
                  </li>
                </ul>
              </li>
              <li class="nav-item">
                <a href="#" class="nav-link">
                  <i class="far fa-circle nav-icon"></i>
                  <p>二级</p>
                </a>
              </li>
            </ul>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">
              <i class="fas fa-circle nav-icon"></i>
              <p>一级</p>
            </a>
          </li>
          <li class="nav-header">标签</li>
          <li class="nav-item">
            <a href="#" class="nav-link">
              <i class="nav-icon far fa-circle text-danger"></i>
              <p class="text">重要</p>
            </a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">
              <i class="nav-icon far fa-circle text-warning"></i>
              <p>警告</p>
            </a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">
              <i class="nav-icon far fa-circle text-info"></i>
              <p>信息</p>
            </a>
          </li>
        </ul>
      </nav>
      <!-- /.sidebar-menu -->
    </div>
    <!-- /.sidebar -->
  </aside>

  <!-- Content Wrapper. 包含页面内容 -->
  <div class="content-wrapper">
    <!-- 内容标题（页面标题） -->
    <section class="content-header">
      <div class="container-fluid">
        <div class="row mb-2">
          <div class="col-sm-6">
            <h1>按钮</h1>
          </div>
          <div class="col-sm-6">
            <ol class="breadcrumb float-sm-right">
              <li class="breadcrumb-item"><a href="#">主页</a></li>
              <li class="breadcrumb-item active">按钮</li>
            </ol>
          </div>
        </div>
      </div><!-- /.container-fluid -->
    </section>

    <!-- 主体内容 -->
    <section class="content">
      <div class="container-fluid">
        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
按钮
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-default">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-lg">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-sm">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-xs">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-flat">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default disabled">默认</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
        <!-- ./row -->

        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
                  按钮外形
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
        <!-- ./row -->

        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
                  渐变按钮 (bg-gradient-*)
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
          <!-- ./row -->
        <div class="row">
          <div class="col-md-6">
            <!-- Block buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">块按钮</h3>
              </div>
              <div class="card-body">
                <button type="button" class="btn btn-default btn-block">.btn-block</button>
                <button type="button" class="btn btn-default btn-block btn-flat">.btn-block .btn-flat</button>
                <button type="button" class="btn btn-default btn-block btn-sm">.btn-block .btn-sm</button>
              </div>
            </div>
            <!-- /.card -->

            <!-- Horizontal grouping -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">水平按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">
                <p>
                  水平按钮组很容易创建，
                  你只需要在 <code>&lt;div class="btn-group"&gt;&lt;/div&gt;</code> 添加按钮
                </p>

                <table class="table table-bordered">
                  <tr>
                    <th>按钮</th>
                    <th>图标</th>
                    <th>扁平化</th>
                    <th>下拉</th>
                  </tr>
                  <!-- Default -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default">左边</button>
                        <button type="button" class="btn btn-default">中间</button>
                        <button type="button" class="btn btn-default">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default">1</button>
                        <button type="button" class="btn btn-default">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-default dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- ./default -->
                  <!-- Info -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info">左边</button>
                        <button type="button" class="btn btn-info">中间</button>
                        <button type="button" class="btn btn-info">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info">1</button>
                        <button type="button" class="btn btn-info">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-info dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /. info -->
                  <!-- /.danger -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger">左边</button>
                        <button type="button" class="btn btn-danger">中间</button>
                        <button type="button" class="btn btn-danger">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger">1</button>
                        <button type="button" class="btn btn-danger">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-danger dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.danger -->
                  <!-- warning -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning">左边</button>
                        <button type="button" class="btn btn-warning">中间</button>
                        <button type="button" class="btn btn-warning">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning">1</button>
                        <button type="button" class="btn btn-warning">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-warning dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.warning -->
                  <!-- success -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success">左边</button>
                        <button type="button" class="btn btn-success">中间</button>
                        <button type="button" class="btn btn-success">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success">1</button>
                        <button type="button" class="btn btn-success">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-success dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.success -->
                </table>
              </div>
            </div>
            <!-- /.card -->

            <div class="card">
              <div class="card-header">
                <h3 class="card-title">附加按钮</h3>
              </div>
              <div class="card-body">
                <strong>使用下拉</strong>
                <div class="input-group mb-3">
                  <div class="input-group-prepend">
                    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
操作
                    </button>
                    <div class="dropdown-menu">
                      <a class="dropdown-item" href="#">操作</a>
                      <a class="dropdown-item" href="#">另一个操作</a>
                      <a class="dropdown-item" href="#">其他</a>
                      <div class="dropdown-divider"></div>
                      <a class="dropdown-item" href="#">分隔符</a>
                    </div>
                  </div>
                  <!-- /btn-group -->
                  <input type="text" class="form-control">
                </div>
                <!-- /input-group -->
                <strong>正常</strong>
                <div class="input-group mb-3">
                  <div class="input-group-prepend">
                    <button type="button" class="btn btn-danger">操作</button>
                  </div>
                  <!-- /btn-group -->
                  <input type="text" class="form-control">
                </div>
                <!-- /input-group -->
                <strong>扁平化</strong>
                <div class="input-group mb-3">
                  <input type="text" class="form-control rounded-0">
                  <span class="input-group-append">
                    <button type="button" class="btn btn-info btn-flat">执行！</button>
                  </span>
                </div>
                <!-- /input-group -->
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->
            <!-- split buttons box -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">分割按钮</h3>
              </div>
              <div class="card-body">
                <!-- Split button -->
                <p class="mb-1">正常分割按钮：</p>

                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default">操作</button>
                    <button type="button" class="btn btn-default dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info">操作</button>
                    <button type="button" class="btn btn-info dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger">操作</button>
                    <button type="button" class="btn btn-danger dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success">操作</button>
                    <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning">操作</button>
                    <button type="button" class="btn btn-warning dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>

                <!-- flat split buttons -->
                <p class="mt-3 mb-1">扁平化分割按钮：</p>

                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default btn-flat">操作</button>
                    <button type="button" class="btn btn-default btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info btn-flat">操作</button>
                    <button type="button" class="btn btn-info btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger btn-flat">操作</button>
                    <button type="button" class="btn btn-danger btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success btn-flat">操作</button>
                    <button type="button" class="btn btn-success btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning btn-flat">操作</button>
                    <button type="button" class="btn btn-warning btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>

                <!-- Split button -->
                <p class="mt-3 mb-1">水平分割按钮：</p>
                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default">操作</button>
                    <button type="button" class="btn btn-default dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </div>
                    </button>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info">操作</button>
                    <button type="button" class="btn btn-info dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger">操作</button>
                    <button type="button" class="btn btn-danger dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success">操作</button>
                    <button type="button" class="btn btn-success dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning">操作</button>
                    <button type="button" class="btn btn-warning dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>


              </div>
              <!-- /.card-body -->
            </div>
            <!-- end split buttons box -->
          </div>
          <!-- /.col -->
          <div class="col-md-6">
            <!-- Application buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">应用程序按钮</h3>
              </div>
              <div class="card-body">
                <p>添加 <code>.btn.btn-app</code> 类到 <code>&lt;a></code> 标签中实现：</p>
                <a class="btn btn-app">
                  <i class="fas fa-edit"></i> 编辑
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-play"></i> 播放
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-pause"></i> 暂停
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-save"></i> 保存
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-warning">3</span>
                  <i class="fas fa-bullhorn"></i> 通知
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-success">300</span>
                  <i class="fas fa-barcode"></i> 产品
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-purple">891</span>
                  <i class="fas fa-users"></i> 用户
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-teal">67</span>
                  <i class="fas fa-inbox"></i> 订单
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-info">12</span>
                  <i class="fas fa-envelope"></i> 收件箱
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-danger">531</span>
                  <i class="fas fa-heart"></i> 喜欢
                </a>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->

            <!-- Vertical grouping -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">垂直按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">

                <p>
                  垂直按钮组很容易创建，
                  你只需要将按钮添加到 <code>&lt;div class="btn-group-vertical"&gt;&lt;/div&gt;</code>
                </p>

                <table class="table table-bordered">
                  <tr>
                    <th>按钮</th>
                    <th>图标</th>
                    <th>扁平化</th>
                    <th>下拉</th>
                  </tr>
                  <!-- Default -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default">顶部</button>
                        <button type="button" class="btn btn-default">中间</button>
                        <button type="button" class="btn btn-default">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default">1</button>
                        <button type="button" class="btn btn-default">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- ./default -->
                  <!-- Info -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info">顶部</button>
                        <button type="button" class="btn btn-info">中间</button>
                        <button type="button" class="btn btn-info">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info">1</button>
                        <button type="button" class="btn btn-info">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /. info -->
                  <!-- /.danger -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger">顶部</button>
                        <button type="button" class="btn btn-danger">中间</button>
                        <button type="button" class="btn btn-danger">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger">1</button>
                        <button type="button" class="btn btn-danger">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.danger -->
                  <!-- warning -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning">顶部</button>
                        <button type="button" class="btn btn-warning">中间</button>
                        <button type="button" class="btn btn-warning">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning">1</button>
                        <button type="button" class="btn btn-warning">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.warning -->
                  <!-- success -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success">顶部</button>
                        <button type="button" class="btn btn-success">中间</button>
                        <button type="button" class="btn btn-success">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success">1</button>
                        <button type="button" class="btn btn-success">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.success -->
                </table>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->

            <!-- Radio Buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">单选按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">
                <p class="mb-1">单选按钮组使用 <code>.btn-secondary</code></p>
                <div class="btn-group btn-group-toggle" data-toggle="buttons">
                  <label class="btn btn-secondary active">
                    <input type="radio" name="options" id="option1" autocomplete="off" checked> 选中
                  </label>
                  <label class="btn btn-secondary">
                    <input type="radio" name="options" id="option2" autocomplete="off"> 单选
                  </label>
                  <label class="btn btn-secondary">
                    <input type="radio" name="options" id="option3" autocomplete="off"> 单选
                  </label>
                </div>

                <p class="mt-3 mb-1">单选按钮组使用 <code>.bg-olive</code></p>
                <div class="btn-group btn-group-toggle" data-toggle="buttons">
                  <label class="btn bg-olive active">
                    <input type="radio" name="options" id="option1" autocomplete="off" checked> 选中
                  </label>
                  <label class="btn bg-olive">
                    <input type="radio" name="options" id="option2" autocomplete="off"> 单选
                  </label>
                  <label class="btn bg-olive">
                    <input type="radio" name="options" id="option3" autocomplete="off"> 单选
                  </label>
                </div>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->
          </div>
          <!-- /.col -->
        </div>
        <!-- /. row -->
      </div><!-- /.container-fluid -->
    </section>
    <!-- /.content -->
  </div>
  <!-- /.content-wrapper -->
  <footer class="main-footer">
    <div class="float-right d-none d-sm-block">
      <b>版本</b> 3.0.5
    </div>
    <strong>Copyright &copy; 2014-2019 <a href="http://adminlte.io">AdminLTE.io</a>.</strong> 保留所有
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  </footer>

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  <aside class="control-sidebar control-sidebar-dark">
    <!-- 控制侧边栏内容在这里 -->
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